1) It/ interesting/ visit/ Phong Nha Cave ( Adj + to- Vinfinitive) 2) they are lucky. they passed all the exams ( Adj + to- Vinfinitive) 3) It/ lovely/ see/ you/ again ( Adj + to- Vinfinitive) 4) I/ delighted/ receive/ your massage. ( Adj + to- Vinfinitive) 5) We/ happy/ receive/ a lot of presents from our grandparents( Adj + to- Vinfinitive)

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